Q. A 78-year-old female presents to the clinic with concerns for memory loss. Over the last 5 years, she has had a gradual decline in her memory. She has difficulties keeping up with conversations, cooking, cleaning, and remembering appointments, and she has forgotten to pay the bills before the due date on numerous occasions. She often misplaces objects and is no longer able to drive. Her vitals are within normal limits. Her neurological exam reveals a Mini-Mental State Examination (MMSE) score of 12. Your leading diagnosis is Alzheimer's disease. Which of the following is the mechanism of action for the first-line medication used to treat this patient's underlying diagnosis?